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Inclusive Photoproduction of Light Mesons at HERA: Results from H1 Collaboration

This study presents the first measurement of inclusive photoproduction of light mesons (h, r0, f0(980), and f2(1270)) at HERA, leveraging data from the H1 experiment. The analysis reveals the universal behavior of hadron production in the central rapidity plateau of hadronic events, demonstrating a good agreement between data and Monte Carlo simulations. The preliminary results for differential cross-sections of r0, f0, and f2 mesons at an average photon-proton center-of-mass energy of 210 GeV provide critical insights into quantum chromodynamics (QCD) and particle production mechanisms at high energies.

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Inclusive Photoproduction of Light Mesons at HERA: Results from H1 Collaboration

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  1. A.Kropivnitskaya Inclusive Photoproduction of Light Mesons at HERA (h, r0, f0(980) andf2(1270) ) ITEP, Moscow On behalf of H1 Collaboration

  2. HERA – a laboratory for hadroproduction dN/dy plateau rapidity y В Universality in the behaviour of hadroproduction in central rapidity plateau in the hadronic events. Features ofQCD vacuum.

  3. Particle production measurements at high energy + - has been measured / ? - no experimental information

  4. Photoproduction Data Selection g + p h + X e <W > = 210 GeV r0, f0, f2 p+p- g gp h gg h+X p e ds ds and to be measured dydpT2 dy h =h, r0, f0(980) orf2(1270) p = track in CJC g = cluster in LAr |ylab| < 1 for h

  5. Comparison of Data vs Monte Carlo Simulation [GeV] E D [cm] clust R [cm] ct tr MC DATA N q track track Good agreement between Data and simulation enables reliable calculation of the efficiencies and detector effects | cos(a)|

  6. Fit Procedure

  7. H1 inclusive of r0, f0 and f2 photoproduction dN/dM [1/GeV] M(p+p-) [GeV]

  8. H1 inclusive of h photoproduction H1 Preliminary 3 < pT < 8 GeV |y|<1 dN/dM [1/GeV] Fit = Gaussian + Polynomial M(gg) [GeV]

  9. Statistical and Systematic Errors f0

  10. H1 inclusive meson photoproduction <Wgp> = 210 GeV H1 Priliminary ds/dy [nb] ds/(dydpT2) [nb/GeV2] r0 f0 f2 h y PT [GeV]

  11. Universal behaviour of hadron photoproduction HERA photoproduction 1/(2j+1)ds/(dydpT2) [nb/GeV2] } r0 f0 H1 Prelim f2 h p+published M+PT [GeV]

  12. Conclusions 1. The first measurement of inclusive h, r0, f0(980) andf2(1270) mesons at HERA (H1 experiment). 2. Preliminary results on differential meson photoproduction cross-sections. 3.The inclusive cross-section for hadronic resonances has approximately the same behavior as observed for long-lived hadrons

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